Wanted to add something into the mix here.... Drilling of Shale that is going on in LA, TX and yes Arkansas ..

Map
[link to www.ogfj.com]

[link to www.ogfj.com]

It is also done by fracking

There are two kinds of oil and gas deposits: conventional and unconventional. The Haynesville Shale is considered an unconventional deposit by geologists because the methane gas is not located in highly porous rock formations which create easy-to-access pockets of gas (known as “conventional” deposits).
In the Haynesville Shale, the source rock in the shale has to be fractured to release the gas

[link to www.loga.la]